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August 27, 2015 - Don Khon (Laos). Locals fish at the Tat Somphamit waterfalls. Experts say that the Don Sahong's dam will put at risk the ecological integrity of the Lower Mekong as a whole. In particular, it will have a severe impact on the endangered giant catfish, other fish species — some of them unique to the Mekong — and the Irrwaddy dolphin, which has found a natural habitat just two kilometers from the dam and is already critically endangered. © Thomas Cristofoletti / Ruom